The weird problem came from not enough current. I switched the power source and then everything went fine. Though the Pizero is highly not recommended for any Recalbox project. The menu is very, sluggish if the output is an average Hdmi monitor with 720p. The pizero should only be used for handheld tft displays with lower resolutions. Then it works fine. I think I will do a Gameboy Hack, if I find one. Or maybe use an old nes controller.
